Pressure-regulating device for intermediate steam-withdrawal installations



Aug. M, w23.

R. BOSSELMANN PRESSURE REGULATING DEVICE FOR INTERMEDIATE STEAM WITHDRAWAL INSTALLATIONS Filed June 1v. 1921 eaaaaa aaa. te, reas;

atteste antena crearse.

ENTRARE BOSlELMANN, 0F BERLIN, GERMANY.

UBE-EEGULATNG DEVICE FOB, ENTIERMJEDATE STEAM-WIIHDBAWAL ms'rnmerrons.

application' mea rimer?, naar. semi at. avatar.

To all whom' it manly-concern.' Be it known t at l, RICHARD 'Bossen- MANN, a resident of Berlin, Germany, of German nationality, have invented certain new and useful Improvements in Pressure- Regulating Devices for Intermediate Steam- Withdrawal Installations (for which l have filed ap lication in Germany Dec. 27, 1918, Patent o. 333,296), of which the followin is a speciication.

a n order to malntain constant the receiver pressure which iuctuates wlth the load on u the steam engine and thereby to ermit use of the quantity of steam drawn o with u niform pressure,in most cases the regulatlon of the cut-0E of the low pressure cylinder was automatically made ldependent on the draw-o pressure.

ln steam engines whichpreviously were not fitted with this regulating device the subsequent fitting of the controlling .means presents diiliculties and for this reason the simpler though less economical method of fitting stop valves in the draw-off pipe and in the pipeleading to the low pressure cylinder` has been employed. rlhese two valves are positively connected with one another and 1n their movement are dependent on the draw-off pressure to be maintained constant in such manner that according to the load on the engine or the quantity of steam to be drawn o the one valve is closed by the same amount as the other is simultaneously opened vand vice versa. The total cross sectional passage area of both valves is thus at all times and in any position equal to the total cross section only of one valve so that these valves must be of excessively large cross section if throttling is to be avoided.

Hereinafter is described a new arrangement in which objectionable throttling is avoided, both valves opening to the full extent on normal load on the engine and with the most vfavourable steam draw-0H quantities.

l' The i proved regulating device is illustrated the accompanying drawing in which Fig. 1 is a view of the whole arrangement while Fig. 2 shows to enlarged scale the auxiliary controlling piston, the return sleeve and the pressure iiuid path.

As shown, the steam Howing from the high-pressure cylinder passes first into aV T- shaped piece t, and from there lone part E. TEE PRVISIONSOW Tm ACQ? 0F MARCH 3, 1921, 41 STAT. E., 71313.)

the normal engine load, one part of the quantity of steam coming from the high pressure cylinder flowing -to the low pres- .sure cylinder, the other part to the place of Both throttle valves are in this central position fully open. The pressures in the receiver and behind the two throttle valves are' thus equal at the two measuring points s and s2 of the duplex manometer.

rlhe auxiliary piston k moved by the l I pressure fluid, the small auxiliary controlling piston 11 and the diaphragm m lunder the influence of the draw-o pressure are also in middle position. The auxiliary controlling piston z' is connected directly with the, diaphragm m and is moved in a sleeve It provided with passages, the lmovement of `which sleeve positively by a lever transmission is dependent on the movement of the auxiliary motor piston la. This intermedi' ate piston fulils the same requirements as the return in the direct regulators (servo motors) but has the advantage that its sensitiveness can be varied within wide limits since the joint g is adjustable with respect t0 the xed pivot p so that the movement of the sleeve can be regulated to zero and highly sensitive regulation obtained. lin mosty cases, however, less sensitiveness for example of 5% will be'sucient.

If now a greater load is put on the engine or a reduction in the consumption of steam at the place of use takes place, an increase in the pressure vat t occurs. By the increase of pressure the diaphragm m is pressed downwards out of its osition of equilibrium and the flow of o1l under pressure to the space above the auxiliary piston k is permitted by the auxiliary piston t. rllhe servo-motor piston is in consequence moved downwards until by the adjustment of the. throttle valve d the pressure has decreased again at the point e and the sleeve Iz. has correspondingly stopped the movement of the piston 7c -by covering the oil pressure passages.

lf steam is cut o from` the pointat which it is consumed the throttle valve d is closed and the lever fn, assumes.

its lowest position indicated by the lower dotted line.

The throttle valve d will again lopen as soonas steam is taken at the point of con'- Sumption; the weight o prevents the throttle valve d2 from being closed before d is' fully open.

If-an increased amount of steam is drawn sure in t is reduced. The servo motor piston is thereby movedupwards in the reverse direction until the throttle valve d2 by throttling the steam flowing to the low-pressure cylinder has restored 4the normal pressure in t or through the open throttle valve d the pressure at the point s. When the throttle valve d2 is fully closed the lever n is in its highest position shown in the drawing by the upper dotted lin'e. Thus'it will be seen that either both valves' d and d2 i may be moved alternately or either one of them,'the other remaining stationary, depending u on the draw-olf pressure. The re ative dependence of the two throttle valve postions'can also be eiected positively or b interlocking in lieu of by the weight. he movements of the t'wo throttle valves in consequence of this dependence do not coincide inpoint of time.

In order to prevent too great a quantity of steam being drawn oii or too great throttling of thei steam ilowing to the low pressure cylinder there is arranged a double manometer connected beyond V the two .throttle valves by means of which the valve arranged in the draw-oil pipe and' another stop-valve in the pipe leading to the low-pressure cylinder these valves being separately and automatically controlled under the iniuence of the draw-olf pressure.

2. In an apparatus for regulating the drawing 0E pressure in the intermediate steam withdrawal in steam engines a stopvalve arranged in the draw-olf pipe and another stop-valve in the pipe leading to the low pressure cylinder, these valves being separately controlled by a servomotor under the influence of the draw-off pressure.

3. In an apparatus for regulating thel valve arranged in the drawotf pipe and another stop-valve in the pipe leading to 'the low-pressure cylinder, these valves being alternately controlled b a servomotor under theinfiuence of the a double armed lever loaded .by a weight and journalled on the rod of the servomotor piston, two rods connecting the ends of said.

ever to .thethrottle valves in the steam pipes.

drawing off pressure in the intermediate raw-oil'l pressure, and

4. In an apparatus for regulating the steam withdrawal in steam engines a stopvalve arranged in the draw-olf pipe and another 'stop-valve in the pipe leading .to the low-pressure cylinder, these valves being alternately controlled by .the servomotor under the influence of the draw-off pressure actuatlng a piston valve gear in a movablev sleeve with inlet and outlet ports, said Sleeve forming a stop Valve and being connected by an adjustable lever transmission to the servomotor piston.

5. In an apparatus forl regulating the drawing off pressure in the intermediate steam withdrawal in steam engines a stopvalve arranged in the draw-off pipe and another stop-Valve .in the pipe leading to the low pressure cylinder, these valves being alternately controlled by a servomotor under the influence of the draw-oli' pressure, and a double armed lever loaded by a weight and jrournalled on the rod of the servomotor pston, two rods connecting the ends of said lever to the throttle valves in the steamy.

valve arranged in the draw-offv pipe, and

another stop valve arranged in the pipe leading to the low .pressure cylinder, said valves being separately and automatically controlled under the influence of the drawofl' pressure and capable of fully opening their respective pipes without throttling.

In testimony whereof I aflix my signature.

RICHARD BOSSELMANN.

lois 

